Phonograph-cabinet



PHONOGRAPH CABINET. I ABPLICATIoN riLED Nov. 3, 1919.

. 1,359,791. PatenaNv. 23,1920.

' Fig 1 Fig. 3

f7 Magma Maquis? 25.7' M4( M 71129 Afzrneys UNITED srArs NILs HERMAN cnnnneursr, Aor ALHAMBRA., CALIFORNIA.

PHONOGRAPH-GABINET.

lAppncanirinea November 3,1919. seriai No. $35,322.

T 0 all fao/0m it 'may conce/m:

structure. f

Phonograph cabinets of the so-.called cabinet type are commonly lconstructed with av box divided into two compartments. rlhe upper one is openat the top and dis'- posed therein is a phonograph motor mechanism. The lower compartment has a horn or amplifier built in, andis connected to the reproducery or sound box by a tone arm. It is common practice to 'build up the amplifier of wood or metal. Wood amplifiers have' certain disadvantages due to 'the inherent quality of such material in absorbing vibration. Metal, on the other hand,has natural periodsof vibration which accentuate certain tones and destroy the natural quality of the sound. It is the primary vobject of myv invention to provide an amplifier which does not absorb or accentuate vibration. Another object of this invention is to provide an amplifier of the character describedvwith a wall which serves to direct air vibration and acts as al sounding board, whereby the amplifier may bebuilt of wood. A further object of this invention is to provide a wall of the character described which has its greatest amplitude of vibration adjacent the mouth of the horn. y

In addition to the broader features of this invention, there are certain details of construction, whereby a simple, compact, easily assembled and disassembled structure is obtained.

These objects will be more fully understood, as will also other objects and corresponding accomplishments of my invention from the following detailed description of a preferred embodiment thereof. For the purpose of this description, reference is had to the accompanying drawing, in which:

Figure l is a front elevation of a phonograph cabinet with a portion in section showing the amplifier; Fig. 2 is an enlarged section taken on the line 2 2 of Fig l.

'showing the amplifier; andFi'g. 3 is a perspective view of the sounding lboard. I j

Referring more particularly to Fig. 1 the cabinet proper` is indicated byv A. rlhe phonograph motor mechanism is indicated` Specification of Letters Patent. Patented 23, 19520, i

generally by B, and the amplifier bjr-G. A Y

wall or partition extends.across-thelcabinet vdividing the latter into a chamber D in'I which records and other accessories may be stored, and an amplifier chamber f Disposed in the amplifier chamber E yand extending thereacross at an anglais .the

sounding board base 5. The base isycut with a recess 6 on the upper side to accommodate the motor mechanism (of the phonograph machine, the latter being indicated by dotted lines in Figs. 1 and 2. The base may be attachedl by screw. extending throughv`v an opening Sand engaged with the bottom` of the cabinet. A Inortise or groove 9 is provided uponthe `face of the base board to receive one end of the soundingboard 10, the other end being disposed ina recess 11. Secured to the sounding board and base board by any suitable meansis a block 12which closes the space between the soundingl board and the partition ,4. The face ofthe block j 12 is inclined fromtop to bottom. f

VThe sounding board 10 is preferably of spruce. It is sprung into place when dry, and serves as yone wall of the amplifier. At

theforward end of the lsounding board are a number of holes 13, which increase the Ifesiliency of the board at its pointof attachment to thevbase board and allow a greater amplitude 'of vibration at the mouth. TheA walls i and 10, the latter being a sounding board, .provide a flaring chamber.

' Mounted upon lthe'topfof the base board 5 the cabinet, except at the rear thereof. Xn

order to close the spaces at the top and bottom edges, felt strips 16 and 1,7 are secured to' the.V sounding board, thereby preventing the direct passage of air vibrations to the desired.

rear thereof. The front of the cabinet is provided with openings 18 extending across the face thereof, some of these serving to permit the passage of sound waves, while the remaining ones, although having no function, enhance the ornamental appearance of the cabinet.

The position of the handle for winding the machine and other parts for the control of its speed, as well as receptacles for needles and other accessories may be provided, as These, however, form no part of my invention and are not shown or described in detail. One wall of the amplifier is formed by a sounding board, which may be detachably secured in the cabinet.

That I claim is:

l. In a .phonograph cabinet having a boxlilre chamber, a sounding board anchored at the back and front edges, the other edges being free and undamped, said board extending across said chamber to define an amplifier' horn tube.

2. In a phonograph cabinet having a boxlike chamber, a sounding board extending` across said chamber to define an amplifier hornsaid boa-rd having the greatest resiliency adjacent the mouth end of said horn.

3. In a phonograph cabinet having a boxlilre chamber, a sounding board anchored at the back and front edges, the other edges being free and undamped, said board extending across said chamber to form a wall of an amplifier horn, said board having the greatest resiliency adjacent the mouth of said horn.

et. In a phonograph cabinet having a boxlike chamber, a base board extending across said chamber, and a sounding board on said base board supported under tension between the ends thereof to form a side of the amplifierv horn, the other edges thereof free and undamped.

5. In a phonograph cabinet having a boxlike chamber, a base board extending across said chamber, Aand a sounding board on said base'board supported under tension between the ends thereof to form a side of the amplifier horn, saidV sounding board having its greatest resiliency at the mouth end of said horn.

6. In a phonograph cabinet having a boxlike chamber, a base board extending across said chamber, and a sounding board on said base board supported under tension between the ends thereof to form a side of the amplifier horn, said soundingr board having a portion of the material thereof cut away at the forward end to provide greatest resiliency vsaid chamber, a sounding board on said base board supported under tension *between the ends thereof to form a side of an amplifier horn, and a phonograph board adapted to support the phonograph motor mechanism disposed above said sounding board, said sounding board being spaced away at its bottom edge from thev bottom wall of said chamber and spaced away at the top edge from said phonograph board so as to be free to vibrate.

' 9. In a phonograph cabinet having a boxlilze chamber, a base board extending across said chamber, a sounding board on said base board supported runder tension between'the ends thereof to form a side of an amplifier horn, a phonographboard adaptedto support the phonograph motor mechanism disposed above said Sounding board, said sounding board being spaced away at its bottom edge from the top wall of said chamber and spaced away at the top edge from said phonographV board so as to be free to vibrate, said sounding board having its greatest resiliency to vibration at its forward end adjacent the mouth of said horn. l0. In a phonograph cabinet having a box-like chamber, a base board extending across saidY chamber, a sounding board on said base board supported under tension between the ends thereof to form a side of an amplifier horn, and a phonograph board adapted to support the phonograph motor mechanism disposed above said sounding board, said sounding board being spaced away at its'bottom edge from the bottom wall of said chamber and spaced away at the top edge from said phonograph. board so as to be free to vibrate, said sounding board beingperforated at its forward end to increase the amplitude'of its vibration.

In witness that I claim thel foregoing I have hereunto subscribed my name this 28th day of October, 1919.

NILS HERMAN CEDARQUIST. 

